$(function(){
    var her = document.documentElement.clientHeight || document.body.clientHeight
    $('.main_frm').css({
        'min-height': her-5
    });
})

function doalert(msg,title="提示"){
    $('#myModal .modal-title').html(title);
    $('#myModal .modal-body').html(msg);
    $('#myModal').modal({
              keyboard: false
            })    
}